Air-pump governor



(No Model.) i Q G. F. WBNTZP R AIR PUMP GOVERNOR. 'No. 574,648. vPatented Jan. 5, 1897.

1 mmunnmlllmiI ummuugmmmmu Ry hisJliiw a s, l geft mni UNITED STATESPATENT OFFICE.

GEORGE FRANKLIN VENTZ, OF COLORADO SPRINGS, COLORADO.

AIR-PUMP GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 574,648, dated January5, 1897. Application filed February 16, 1896. Serial No. 578,773. ormodel.)

To all whom it may concern:

Be it known that I, GEORGE FRANKLIN ENTZ, a citizen of the UnitedStates, residing at Colorado Springs, in the county of El Paso and Stateof Colorado, have invented a new and useful Air-Pump Governor, of whichthe following is a specification.

My invention relates to governors for airpumps used in connection withfluid-pressure brake mechanisms; and the object in view is to provide asimple, inexpensive, and efficient construction and arrangement of partswhereby the pump employed for supplying air to the train-pipe of thebrake mechanism is controlled by pressure in the train-pipe or otherpart of the mechanism to prevent the pressure from exceeding apredetermined limit.

Further objects and advantages of this invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings, Figure 1 is a longitudinal section of a governorconstructed in accordance with my invention. Fig. 2 is a transversesection on the line 2 2 of Fig. 1. Fig. 3 is a transverse section on theline 3 3 of Fig. 1.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings.

The valve-casing 1 is provided at one end with an inlet-port 2 and atthe opposite end with a cap 3, having an outlet-port 4, said inlet-portbeing adapted to admit steam from the boiler or other source, and theoutlet-port being adapted for communication by means of a suitable pipeor conductor (not shown) with the pump for the control of which theimproved governor is designed. Arranged concentrically within the casing1 is a tubular valve-seat 5, provided with lateral openings or slots 6,said seat being of smaller diameter than the casin g, whereby it isexposed at all sides to the steam-pressure admitted through theinlet-port 2. The valve-seat is supported in the desired position in theeasing by means of an annular collar 7, preferably formed integral withthe casing, one end of the seat being threaded therein. An annularsecuring-plate 8 is secured to one side of the collar 7 and projectsinwardly to overhang the bore of the valve-seat, whereby the rotarytubular valve!) is held in operative position in the seat. Saidsecuring-plate is fastened by means of suitable screws 10.

The valve is provided with openings 11 similar to the openings 6 in thevalveseat, and the valve is normally held in such a position as to alinesaid openings, or is held in its open position by pressu reresistingdevices, including an actuating-spring l2 and connections between saidspring and a terminal lug 13 on the open end of the valve. In theconstruction illustrated this lug is engaged by the notched end 14. of alever 15, which is mounted in the casing 1 and is connected to the innerextremity of a stem 16, actuated by said spring 12. The lever ispreferably fulcrumed upon a pin 17, carried bya set-screw 18, insertedfrom the outside of the casing and provided with a head or wrench-seat19, and the stem lfi'enters the casing 1, through a stuffing-box 20,from a spring-casing 21, which is preferably threaded upon a boss 22,formed integralwith the main casing.

The upper extremity of the stem 16 is threaded, as shown at 23, forengagement by an adjustable collar 21. adapted to be arranged indifferent positions upon the stem to vary the tension of theactuating-spring l2, and this collar or seat 24 for the upperend of thespring has formed integral therewith a piston-head 25, operating in anair-pressure cylinder 26, preferably formed in the removable cap of thespring-casing 21. In order to prevent accidental change in theposition'of the seat 2% and piston-head 25, a jam-nut 28 is threadedupon the extremity of the stem. The piston is preferably provided with apackingring 29.

The air-pressure cylinder 26 is exposed to fluid-pressure in the brakemechanism, and it will be seenthat when the pressure in said brakemechanism is in excess of the tension of the actuating-spring 12,whereby the valve is normally held open, the piston 25 will be depressedand the valve will be closed more or less, according to the extent ofthe excess of pressure in said cylinder. By adjusting the collar or seat24 the tension of the spring may be varied to provide for the closing ofthe valve at any desired pressure in the brake mechanism. Adrain-passage 30 comm uni cates with the bottom of the spring-casing tocarry off moisture which may gain access thereto.

As above described, the valve seat is threaded into the annular collar7, and in order to facilitate the engagement of the interlocking threadson the seat and collar I provide the closed end of the valve-seat, whichas shown in the drawings, is in the form of a cage, with a wrench-seat31, which is accesconnect the governing devices to the extremi ity ofthe spindle of the valve.

It will be seen that no portion of the bearcasing and operativelyconnected with the valve, a stem connected at one end to the leverwithin the casing and extending through a stuffing-box in the side ofthe casing, a piston secured to the outer end of the stem and arrangedin a pressure-cylinder exposed to fluid-pressure, and yielding meansconnected with the stem for normally holding the valve open,substantially as specified.

2. An air-pump governor having a main casing provided with an interiorannular collar 7, a tubular valve-seat threaded at one end in saidcollar and provided at the other end with a wrench-seat which isaccessible through the inlet-port of the main casing, a rotary valvemounted in said seat, and yielding means for holding the valve open,said means including a piston exposed to fluidpressure, substantially asspecified.

3. An air-pump governor having a main casing exposed to steam-pressureand a rotary ing of the valve shown in the drawings is exposed, andhence dust is entirely excluded} and the efficiency of the valve isgreatly in- 1 creased. Furthermore, by arranging the lever within thecasing of the valve it is pro tected from accumulations of dust, and yetthe reduction of pressure by leakage is pre vented by reason of thestuiling-box through which the stem operates.

All of the parts of the improved governor are accessible to provide fornecessary cleaning or adjustment, and it is obvious that various changesin the form, proportion, and the minor details of construction may beresorted to without departing from the spirit or sacrificing any of theadvantages of this invention.

Having described my invention, what I claim is 1. An air-pump governorhaving a casing exposed to fluid-pressure, and a rotary valve seated inthe casing, a lever inclosed in the valve seated in the casing, a leverprovided at one end with a notch engaging a lug 011 said valve, a stemarranged at one end within the casing and connected to said lever, aspringcasing removably secured to the main casing and inclosin g theexposed portion of said stem, a cap removably fitted in the outerextremity of the spring-casing and forming a pressurecylinder exposed tofluid-pressure, a piston adj ustably mounted upon said stern andoperating in the presstire-cylinder, a collar carried by the piston, anda spring arranged in the spring-casing and seated at one end upon saidcollar to normally hold the valve open, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

GEORGE FRANKLIN VENTZ.

Vitnesses:

WALTER C. Fnos'r, I). C. MILLARD.

